Type/grade of fuel selection - Honda CBR 300 Forum
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post #1 of 7 Old 04-12-2015, 07:09 PM Thread Starter
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Cool Type/grade of fuel selection

Newbie here. Just curious, what grade of fuel do you guys use? I know that the owner manual says anything above 86 will be fine. I was told by my dealer to use premium all the time. I don't really care about the price difference, since it's only 6-7 bucks to top off near my area, I just want to see what you guys think/do...

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post #2 of 7 Old 04-12-2015, 09:37 PM
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use the best you can buy! I use chevron gas and diesel in my vehicles, it is the best quality in northern cal. imo, but everybody has their favorite brand.
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post #3 of 7 Old 04-12-2015, 09:53 PM
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honda recommends 91RON about 86PON or higher..
octane rating relates to pre-ignition or 'knock' or 'ping'
which is - bad - where higher octane rating resists
pre-ignition thru slower burning fuel..

basically, higher compression ration requires higher
octane slower burning petrol to resist pre-ignition..
cbr300r compression ratio is [only] 10.7:1

compare; cbr250rr/4 11.5 : 1, cb400rr cr 11.3 ; 1, cbr600r
12.2 : 1, cbr1000rr 12.3 : 1..
when fuel/air is highly compressed in combustion chamber
pre-ignition [fuel starts burning before spark plug ignites it]
is more likely to happen, thus slower burning high octane rating
petrol is required for use in high compression combustion chambers..

aside from additives designed for car engines
you get zero extra power or efficiency from
slower burning ie, higher octane rating petrol..
honda has designed our combustion chamber
for flame throw based on faster burning
91ron [86pon] petrol.. it works better..

i have paid the 'premium' for higher octane petrol
a few times in emergencies, to avoid ethanol
in their 91ron petrol..
no difference in power of performance..
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post #4 of 7 Old 04-12-2015, 10:50 PM
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"shisoshin" at last someone that understands,most people on this forum think that if it costs more it must be better.


If 91 ron was not ok then Honda would not recommend it as there would be too many damaged engines claiming on the warranty.


And as you rightly point out running a higher ron is going to give you less power.
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post #5 of 7 Old 04-12-2015, 11:33 PM
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I think we've had this discussion somewhere before, but I use the base 87 octane with the 10% or less of ethanol which is commonly found in my area. Works great, and I don't witness or feel any negative effect.

Someone on here did mention that he felt reduced rattling after filling with premium grade. I don't know, but I suppose you could experiment and try for yourself.


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post #6 of 7 Old 04-13-2015, 01:05 PM
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Quote:
Originally Posted by Fanatic View Post
I think we've had this discussion somewhere before...
Here in this thread: http://www.cbr300forum.com/forum/eng...additives.html
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post #7 of 7 Old 04-13-2015, 10:44 PM
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Correctamundo.


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